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Texas Instruments LM46002PWPR
- Part No.:
- LM46002PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46002PWPR.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,660
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Product details
Overview
LM46002PWPR from Texas Instruments is a 3.5-V to 60-V, 2-A synchronous step-down DC/DC converter in HTSSOP-16 package. It delivers high efficiency across wide load range using peak-current-mode control, features internal compensation, power-good flag, and soft-start into prebiased loads - deployed in industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM46002PWPR datasheet, LM46002PWPR pinout, LM46002PWPR application, or LM46002PWPR equivalent, key selection criteria include input voltage range (3.5–60 V), quiescent current (27 µA), EN precision threshold (2.1 V typ), thermal shutdown (160 °C), and EMI compliance with EN55022 Class B.
Technical Context
The LM46002PWPR employs peak-current-mode control for stable loop response and cycle-by-cycle current limiting. Its integrated high-side (210 mΩ) and low-side (110 mΩ) MOSFETs enable synchronous rectification without external diodes, reducing conduction loss and improving light-load efficiency via DCM/ PFM operation.
It supports frequency adjustment (200 kHz–2.2 MHz) via RT pin or synchronization to external clock (SYNC pin), and includes precision enable with 294-mV hysteresis for system-level UVLO sequencing. Internal soft-start (4.1 ms) and output voltage tracking (SS/TRK pin) support controlled power-up in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports wide-input industrial and automotive battery-supplied systems without external pre-regulation. |
| Output Current | 2 A continuous - sufficient for point-of-load regulation of FPGAs, microcontrollers, and DSPs. |
| Quiescent Current | 27 µA in regulation - enables ultra-low standby power in always-on applications like telematics and sensor nodes. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable - allows optimization of size (higher fSW → smaller L/C) vs. efficiency (lower fSW → lower switching loss). |
| Feedback Reference | 1.011 V ±10 mV - ensures tight output voltage accuracy (±1%) over temperature and line/load conditions. |
| Thermal Shutdown | 160 °C with 10 °C hysteresis - protects against sustained overload or poor PCB heatsinking in enclosed environments. |
| EMI Compliance | Meets EN55022 Class B radiated/conducted emissions - reduces need for external filtering in commercial-grade equipment. |
Pinout & Package
LM46002PWPR is housed in a 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm with 0.65-mm lead pitch and exposed PowerPAD™ for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance PCB trace to minimize EMI and voltage spikes. |
| 3 CBOOT | Bootstrap capacitor connection | Provides gate drive voltage for high-side MOSFET; requires 470-nF ceramic capacitor between CBOOT and SW. |
| 4 VCC | Internal bias supply output | Bypassed to AGND with capacitor; powers internal circuitry - no external load permitted. |
| 5 BIAS | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external rail; bypass with 1–10 µF capacitor if used. |
| 6 SYNC | External clock input | Enables frequency synchronization to avoid beat frequencies in multi-converter systems; terminate properly to prevent ringing. |
| 7 RT | Frequency programming | Resistor to AGND sets switching frequency; open-circuit defaults to 500 kHz. |
| 8 PGOOD | Open-drain power-good flag | Signals valid output after soft-start and regulation; requires external pullup (10–100 kΩ) to logic rail ≤12 V. |
| 9 FB | Feedback sense input | Monitors output via resistor divider; sets VOUT = 1.011 V × (1 + RFBT / RFBB); avoid grounding during operation. |
| 10 AGND | Analog ground reference | Ground return for internal references and logic; connect directly to system ground plane with low-impedance path. |
| 11 SS/TRK | Soft-start and tracking control | Extends soft-start time with external capacitor or accepts external ramp for voltage sequencing in multi-rail systems. |
| 12 EN | Enable input | Logic-level control: high ≥2.1 V enables regulator; low ≤0.4 V disables - supports precise system-level UVLO. |
| 13,14 VIN | Main input supply | Connects to input capacitors (CIN); path to PGND must be shortest possible to minimize high-frequency loop area. |
| 15,16 PGND | Power ground | Low-side MOSFET source return; tie to AGND, PAD, and capacitor grounds - critical for thermal and EMI performance. |
| PAD | Exposed thermal pad | Internally connected to AGND; must be soldered to large copper pour for heat dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and conduction losses - improves full-load efficiency by up to 5% vs. asynchronous designs. |
| Adjustable soft-start (4.1 ms internal) | Prevents inrush current during power-up; extendable with external capacitor on SS/TRK pin for controlled sequencing in multi-voltage systems. |
| Power-good flag with deglitching | 220-µs rise/fall deglitch ensures robust detection of output faults - avoids false triggering during transient load steps or startup overshoot. |
| Stable with diverse output capacitors | Compatible with ceramic, polymer, tantalum, and aluminum electrolytic capacitors - simplifies design flexibility and cost optimization. |
| Output short-circuit protection | Hiccup-mode recovery (5.5-ms retry delay, 32-cycle wait) limits average fault current and prevents thermal runaway during sustained shorts. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: Distributed 24-V or 48-V DC distribution powering field I/O modules, PLCs, and sensors. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting bus voltage to 3.3 V or 5 V for microcontrollers and communication ICs. Use Value: Wide 3.5–60-V input accommodates brownout and surge conditions; 27-µA IQ extends uptime in battery-backed systems. |
Use Scenario: Intermediate bus conversion in base station power shelves feeding RF transceivers and digital signal processors. IC Role / Device Role / Timing Role: High-efficiency buck stage delivering stable 12 V or 24 V from 48-V telecom bus under dynamic load. Use Value: Meets EN55022 Class B EMI limits without added filters; 2-A capability supports burst-mode LTE/5G processing loads. |
| Sub-AM Band Automotive | Commercial Vehicle Power Supplies |
Use Scenario: Infotainment head units and ADAS camera modules operating from 12-V vehicle battery with cold-crank (4.5 V) and load-dump (60 V) tolerance. IC Role / Device Role / Timing Role: Input-stage regulator providing clean, regulated 5 V or 3.3 V to SoCs and image sensors. Use Value: 60-V absolute max rating and hiccup-mode short-circuit protection ensure reliability during load-dump transients. |
Use Scenario: Power management in heavy-duty truck telematics, fleet tracking, and ECU gateways requiring 24-V input compatibility. IC Role / Device Role / Timing Role: Main DC/DC converter generating 5 V and 3.3 V rails for CAN controllers, GPS receivers, and cellular modems. Use Value: Precision enable (2.1 V threshold) enables coordinated power sequencing with vehicle ignition status; thermal shutdown guards against engine bay ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46001PWPR | 1-A output current rating; identical pinout, package, and feature set except reduced current capability and higher RDS(on). | Suitable for lower-power loads where 2-A headroom is unnecessary - saves cost and board space in sensor nodes or auxiliary rails. | Select LM46001PWPR only when maximum load current remains ≤1 A; verify thermal margin with same PCB layout. |
| LM43602PWPR | 36-V max input (vs. 60 V); otherwise identical pinout, features, and 2-A rating - part of same family but different input voltage grade. | Preferred for 24-V systems with tighter input transients (e.g., industrial automation), where 60-V rating is over-specified. | Choose LM43602PWPR for cost-sensitive 24-V applications with no requirement for >36-V operation; not suitable for automotive load-dump scenarios. |
Compared with LM46001PWPR and LM43602PWPR, the LM46002PWPR uniquely combines 60-V input tolerance with 2-A output and full feature set - making it the only option among the three for automotive load-dump resilience and high-current industrial use cases.
Availability
LM46002PWPR is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications systems, and sub-AM band automotive applications requiring stable component supply and long-term production continuity.
Supply support for LM46002PWPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM46002PWPR belongs to TI's wide-input synchronous buck converter product line, engineered for rugged, high-reliability DC/DC conversion in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the recommended minimum input voltage for reliable startup of the LM46002PWPR?
The LM46002PWPR requires a minimum input voltage of 3.8 V to initiate startup, as specified in the Absolute Maximum Ratings table. Below this threshold, the device remains in shutdown mode regardless of EN pin state. This ensures stable internal bias generation before enabling switching. For designs operating near this limit - such as battery-powered systems at end-of-life - confirm that the full system load does not cause additional dropout below 3.8 V during startup. The LM46002PWPR datasheet specifies this value under ISHDNVIN-MIN-ST test condition.
Does the LM46002PWPR support output voltage tracking, and how is it implemented?
Yes, the LM46002PWPR supports output voltage tracking via the SS/TRK pin. When an external voltage ramp (e.g., from another regulator's soft-start pin) is applied to SS/TRK, the LM46002PWPR's output follows that ramp with unity gain, enabling precise power sequencing in multi-rail systems. This function is distinct from internal soft-start, which occurs when SS/TRK is left floating (4.1 ms typical). Tracking behavior is confirmed in Section 7.3.4 of the LM46002PWPR datasheet and validated in typical application circuits.
What is the thermal resistance (RθJA) of the LM46002PWPR in its HTSSOP package?
The junction-to-ambient thermal resistance (RθJA) of the LM46002PWPR is 38.9 °C/W, measured on a standard 4-layer JEDEC board per JESD51-7. This value assumes proper thermal design: full soldering of the exposed PowerPAD™ to a large internal ground plane and adequate copper area. In real-world layouts with limited copper, RθJA may increase significantly - TI recommends verifying temperature rise under worst-case load (2 A, 60 VIN) using thermal imaging or calculation with actual board geometry. The LM46002PWPR's thermal shutdown activates at 160 °C.
Can the LM46002PWPR operate with ceramic output capacitors only, and what is the minimum recommended value?
Yes, the LM46002PWPR is explicitly designed to be stable with ceramic output capacitors alone - a key feature highlighted in its datasheet. TI recommends a minimum of 150 µF total ceramic capacitance (e.g., multiple 22-µF X5R/X7R 0805 devices in parallel) for typical 3.3-V/2-A designs. Lower values may be used with careful loop compensation verification; however, stability is guaranteed across all ceramic, polymer, tantalum, and aluminum types without external compensation components due to internal compensation architecture.
How does the LM46002PWPR handle short-circuit conditions on its output?
The LM46002PWPR responds to output short-circuits with hiccup-mode protection: it shuts down for 5.5 ms (TOC), then attempts restart for up to 32 cycles (NOC) before re-entering hiccup. During fault, valley current limit (1.8–2.3 A) and peak current limit (3.6–5 A) engage to constrain energy delivery. This prevents thermal damage while allowing automatic recovery once the fault clears - unlike latch-off protection, which requires external reset. This behavior is documented in Section 6.5 (Current Limit and Hiccup) of the LM46002PWPR datasheet.
LM46002PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM46002PWPR FAQ
1.How can I place an order for LM46002PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46002PWPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM46002PWPR reliable?
The price and inventory of LM46002PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46002PWPR is usually 5 days.
3.What payment methods are accepted for LM46002PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46002PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46002PWPR?
LM46002PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46002PWPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM46002PWPR?
For technical support, including LM46002PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46002PWPR requirements.
6.How does Aetrix verify that LM46002PWPR is sourced from the original manufacturer or authorized distributors?
All LM46002PWPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM46002PWPR meets industry standards.
7.What is the process for return or replacement of LM46002PWPR?
All LM46002PWPR units undergo pre-shipment inspection (PSI). If there is an issue with LM46002PWPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM46002PWPR part is unused and in its original packaging.
Return procedure for LM46002PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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